ANNOUNCE: Akka 2.0.1 released!

[√iktor Ҡlang]

Dear hAkkers,

Akka 2.0 has been out since almost 40 days, and so far the echo has been nearly unanimously positive! But of course a few things have popped up, warranting a bug-fix release. Going through the changes below you will find several tweaks and small improvements, with the notable exception of the akka-zeromq module, which comes with vastly improved performance and a few fixed bugs (assertion failures in native code).

Provided that you have not been naughty and accessed “private[akka]” parts, this release should be binary compatible with release 2.0. If something breaks, which you think should not have broken, please yell (this is one more reason to try out the Release Candidates!). In any case, the work-around is to recompile.

Summary of Changes

2.0.1 is the result of a collaboration of 7 contributors (about half by “non-core” developers, thank you very much!) and weighs in at 65 commits with 81 files changed, 1114 additions and 611 deletions. Please refer to the full git log at the end for the gory details.

• improved Java API for accessing singletons like akka.routing.CurrentRoutees and friends (also our beloved PoisonPill)

• reject invalid ActorSystem names which lead to problems when going remote (essentially must be valid hostname components now)

• fixed a live-lock in ForkJoinPool which could occur under rare circumstances with parallelism levels 2 or 4

• reduced overhead of using ask(): less memory footprint and lazy registration

• improvements and fixes for documentation (ScalaDoc as well as reStructuredText)

• make cause and message of AskTimeoutException accessible

• make SmallestMailboxRouter config serializable (this might require recompilation of classes mixing in SmallestMailboxLike)

• fix SmallestMailboxRouter crash upon sending

• make RemoteLifeCycleEvents serializable

• fix TestActorRef for actors setting ReceiveTimeout in constructor

• fix zeromq performance and instabilities by running the polling loop only on the same thread as all other activities for the socket

• never restart zeromq socket actors in case of fatal socket errors

• opened up visibility of RemoteTransport.send() and notifyListeners()

Akka is released under the Apache V2 license.

Website:

http://akka.io

Maven repository:

http://repo.akka.io/releases

Binary distribution:

http://download.akka.io/downloads/akka-2.0.1.tgz

http://download.akka.io/downloads/akka-2.0.1.zip

Documentation:

http://doc.akka.io/docs/akka/2.0.1/

http://doc.akka.io/api/akka/2.0.1/

Issue tracker:

http://www.assembla.com/spaces/akka/

Mailing list:

https://groups.google.com/group/akka-user

Git Shortlog

Havoc Pennington (1):

      Add a warning to Future methods that take an async callback.

Jean-François Im (1):

      Added imports for things moved to akka.pattern._

Mathias Doenitz (6):

      Small optimization in FiniteDuration.equals

      Fix PromiseActorRef bang potentially throwing IllegalStateException

      Make provider registration of PromiseActorRefs lazy

      Improve PromiseActorRef as per team comments

      Another round of improvements to PromiseActorRef

      Decrease memory footprint of PromiseActorRef by ca. 30% (two ref fields)

Peter Vlugter (1):

      Only build the akka sbt plugin against scala 2.9.1

Roland Kuhn (17):

      add section on when to use typed actors

      link to letitcrash post from typed-actors.rst

      remove sjson and h2Lzf dependencies, see #1900

      fix TestKit class scaladoc

      rewrite ZeroMQ poll loop

      remove debug-Thread.sleep

      bump version of scala-bindings to 0.0.5

      incorporate Viktor’s review (part 1)

      fix over-eager polling in zeromq

      clarify typographic error in general/remoting.rst

      reject invalid ActorSystem names, see #1898

      fix CallingThreadMailbox.hasMessages, see #1918

      fix stopping of actors in RouterConfig spec, see #1974

      fix CallingThreadMailbox.numberOfMessages

      re-add akka.serialization.Compression and friends, to keep binary compat

      add Java API for most case objects

      incorporate Viktor’s review

Vibul Imtarnasan (6):

      Added more dispatcher info.

      Update akka-docs/scala/dispatchers.rst

      Added _TestCallingThreadDispatcherRef

      Update as per Roland Kuhn's suggestions

      Added more dispatcher descriptions

      Update akka-docs/scala/dispatchers.rst

Viktor Klang (29):

      #1891 - Adding cause and message to AskTimeoutException

      Removing lie in docs

      New implementation of smallest mailbox router

      Making sure that the code works....

      Collapsing some logic

      Additional simplifications to smallestmailboxrouter

      Introducing so that suspended actorrefs are just better than the dlq

      Adding some more docs to the SmallestMailboxFirstRouter

      #1894 - Switching to jsr166y.ThreadLocalRandom

      #1904 - Clearing up performance aspects of using ask

      #1905 - fixing links to ScalaDoc in the Akka Docs

      #1906 - Clarified the development process

      #1902 - Adding docs in Serialization Java/Scala for deep serialization using EventSourcing

      Making sure that we only publish the truth about watch/unwatch

      Switching to - instead of filterNot

      Switching to the faster append and removed a relative import

      Switching to TreeSet, which should also receive quite some performance enhancements in Scala 2.10

      Fixing merge conflicts on the EventBus

      Making RLCE Serializable and making RemoteTransport in events @transient

      Reverting back to the 2.0 code for the Actorclassification, pending the issue of binary compatibility

      #1964 - Fixing doc example mistake in 0mq docs, no review

      #1957 - Adding warning section regarding jarjar and akka configuration

      #1958 - adding docs for lifecycle hook-parameters

      Manual patch of Doug Leas fix to ForkJoinPool

      Do not tinker with the 0mq socket for the ConnectionSocketActor on Restart

      deprecation annotation on package object does not compile.

      #1971 - Changing to 2.0.1-SNAPSHOT

      #1982 - Opening up the send and notifyListeners methods on RemoteTransport so 3rd parties can extend it properly

      #1931 - correcting logging config examples

Happy hAkking!

Cheers,

√

-- 
Viktor Klang

Akka Tech Lead

Typesafe - The software stack for applications that scale

Twitter: @viktorklang

[Antony Stubbs]

Awesome! Any idea when the akka-camel component will be released? I'm using the snapshot java API for an ActorConsumer - works great!

[√iktor Ҡlang]

I'm having a Deja-vu moment

http://groups.google.com/group/akka-user/browse_thread/thread/2ef6bb18938ffcee

Cheers,

√

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[Antony Stubbs]

haha, sweet as - it's a popular module ;)

Is there a separate tracker for akka-module issues? Anything we can help with? (apart from filing bugs if we find them).

[√iktor Ҡlang]

I'd love to get it in as soon as possible.

But there's still much left to do: http://www.assembla.com/spaces/akka/milestones/934623-akka-camel

I'm hoping to be able to include it in the first 2.1 milestone.

Cheers,

√

[Piotr Gabryanczyk]

On 13 Apr 2012, at 16:43, Antony Stubbs wrote:

Awesome! Any idea when the akka-camel component will be released? I'm using the snapshot java API for an ActorConsumer - works great!

Awesome!:)

Have you seen the video yet?

http://skillsmatter.com/podcast/scala/akka-2-x